package com.atguigu.day07;

import com.atguigu.bean.WaterSensor;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.state.ListState;
import org.apache.flink.api.common.state.ListStateDescriptor;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.api.java.tuple.Tuple;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

import java.util.ArrayList;
import java.util.Comparator;

public class Flink02_KeyedState_ListState {
    public static void main(String[] args) throws Exception {
        //1.获取流的执行环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        env.setParallelism(1);
        
        //2.从端口获取数据
        DataStreamSource<String> streamSource = env.socketTextStream("localhost", 9999);
        
        //3.将数据转为JavaBean
        streamSource.map(new MapFunction<String, WaterSensor>() {
            @Override
            public WaterSensor map(String value) throws Exception {
                String[] split = value.split(",");
                return new WaterSensor(split[0], Long.parseLong(split[1]), Integer.parseInt(split[2]));
            }
        })
                .keyBy("id")
                //针对每个传感器输出最高的3个水位值
                .process(new KeyedProcessFunction<Tuple, WaterSensor, String>() {
                    //TODO 创建ListState用来存放三个最高的水位值
                    private ListState<Integer> listState;


                    @Override
                    public void open(Configuration parameters) throws Exception {
                        //TODO 初始化状态
                        listState = getRuntimeContext().getListState(new ListStateDescriptor<Integer>("list-state", Integer.class));
                    }

                    @Override
                    public void processElement(WaterSensor value, Context ctx, Collector<String> out) throws Exception {
                      /*  //1.将当前的水位保存到状态中
                        listState.add(value.getVc());
                        //2.将状态中的数据取出来
                        Iterable<Integer> vcIter = listState.get();
                        //3.创建一个list集合用来存放迭代器中的数据
                        ArrayList<Integer> vcList = new ArrayList<>();
                        for (Integer integer : vcIter) {
                            vcList.add(integer);
                        }
                        //4.对集合中的数据由小到大进行排序
                        vcList.sort(new Comparator<Integer>() {
                            @Override
                            public int compare(Integer o1, Integer o2) {
                                return o2-o1;
                            }
                        });
                        //5.判断集合中的元素个数是否大于三，大于三的话删除最后一个（最小的数据）
                        if(vcList.size()>3){
                            vcList.remove(3);
                        }
                        //6.架构list集合中的数据更新至状态中
                        listState.update(vcList);

                        out.collect(vcList.toString());*/

                        //先将状态中的数据取出来
                        Iterable<Integer> vcIter = listState.get();
                        ArrayList<Integer> vcList = new ArrayList<>();
                        for (Integer integer : vcIter) {
                            vcList.add(integer);
                        }

                        vcList.add(value.getVc());

                        vcList.sort(new Comparator<Integer>() {
                            @Override
                            public int compare(Integer o1, Integer o2) {
                                return o2-o1;
                            }
                        });
                        //5.判断集合中的元素个数是否大于三，大于三的话删除最后一个（最小的数据）
                        if(vcList.size()>3){
                            vcList.remove(3);
                        }
                        //6.架构list集合中的数据更新至状态中
                        listState.update(vcList);

                        out.collect(vcList.toString());


                    }
                }).print();

        env.execute();
    }
}
